Function 'mtk_hsdma_start_transfer' uses 'tx_desc' pointer which can be
dereferenced before it is initializated. Initializate pointer before
avoiding the problem.
Fixes: 0853c7a53eb3: "staging: mt7621-dma: ralink: add rt2880 dma
engine"
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@xxxxxxxxx>
---
drivers/staging/mt7621-dma/mtk-hsdma.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/mt7621-dma/mtk-hsdma.c b/drivers/staging/mt7621-dma/mtk-hsdma.c
index df6ebf4..5831f81 100644
--- a/drivers/staging/mt7621-dma/mtk-hsdma.c
+++ b/drivers/staging/mt7621-dma/mtk-hsdma.c
@@ -335,6 +335,8 @@ static int mtk_hsdma_start_transfer(struct mtk_hsdam_engine *hsdma,
/* tx desc */
src = sg->src_addr;
for (i = 0; i < chan->desc->num_sgs; i++) {
+ tx_desc = &chan->tx_ring[chan->tx_idx];
+
if (len > HSDMA_MAX_PLEN)
tlen = HSDMA_MAX_PLEN;
else
@@ -344,7 +346,6 @@ static int mtk_hsdma_start_transfer(struct mtk_hsdam_engine *hsdma,
tx_desc->addr1 = src;
tx_desc->flags |= HSDMA_DESC_PLEN1(tlen);
} else {
- tx_desc = &chan->tx_ring[chan->tx_idx];
tx_desc->addr0 = src;
tx_desc->flags = HSDMA_DESC_PLEN0(tlen);
--
2.7.4
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